Left-handed people have a higher risk of suffering from schizophrenia, according to researchers from Yale University.

Writing in Sage Open, the scientists reported that 40 per cent of psychiatric patients suffering from psychotic disorders in one particular sample wrote with their left hand, compared with only 10 per cent in society at large.

Jadon Webb, a psychiatrist, gathered his data from more than 100 patients at an outpatient clinic. Unlike in previous work, where patients had brain scans and were asked a series of questions to determine whether they were left or right-handed, he merely asked them which hand they